From: Zheyu Ma zheyuma97@gmail.com
mainline inclusion from mainline-v6.10-rc1 commit c1115ddbda9c930fba0fdd062e7a8873ebaf898d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA8AEA CVE: CVE-2022-48772
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The driver should check whether the client provides the platform_data.
The following log reveals it:
[ 29.610324] BUG: KASAN: null-ptr-deref in kmemdup+0x30/0x40 [ 29.610730] Read of size 40 at addr 0000000000000000 by task bash/414 [ 29.612820] Call Trace: [ 29.613030] <TASK> [ 29.613201] dump_stack_lvl+0x56/0x6f [ 29.613496] ? kmemdup+0x30/0x40 [ 29.613754] print_report.cold+0x494/0x6b7 [ 29.614082] ? kmemdup+0x30/0x40 [ 29.614340] kasan_report+0x8a/0x190 [ 29.614628] ? kmemdup+0x30/0x40 [ 29.614888] kasan_check_range+0x14d/0x1d0 [ 29.615213] memcpy+0x20/0x60 [ 29.615454] kmemdup+0x30/0x40 [ 29.615700] lgdt3306a_probe+0x52/0x310 [ 29.616339] i2c_device_probe+0x951/0xa90
Link: https://lore.kernel.org/linux-media/20220405095018.3993578-1-zheyuma97@gmail... Signed-off-by: Zheyu Ma zheyuma97@gmail.com Signed-off-by: Mauro Carvalho Chehab mchehab@kernel.org Fixes: 4f75189024f4 ("[media] lgdt3306a: support i2c mux for use by em28xx") Signed-off-by: Tengda Wu wutengda2@huawei.com --- drivers/media/dvb-frontends/lgdt3306a.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/media/dvb-frontends/lgdt3306a.c b/drivers/media/dvb-frontends/lgdt3306a.c index 722576f1732a..9b3f74f3f7b2 100644 --- a/drivers/media/dvb-frontends/lgdt3306a.c +++ b/drivers/media/dvb-frontends/lgdt3306a.c @@ -2213,6 +2213,11 @@ static int lgdt3306a_probe(struct i2c_client *client, struct dvb_frontend *fe; int ret;
+ if (!client->dev.platform_data) { + dev_err(&client->dev, "platform data is mandatory\n"); + return -EINVAL; + } + config = kmemdup(client->dev.platform_data, sizeof(struct lgdt3306a_config), GFP_KERNEL); if (config == NULL) {